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Most of the metal-based phases formed in the process of sludge incineration are toxic and their emissions need to be strictly controlled. The sludge incineration tests using tubular furnace were carried out to study the distribution of heavy metals under different operating conditions. The emphasis has been on the study of the behavior of the potentially most harmful metals present in the sludge in...
With the Tessier Five-step Continuous Extracting Method, the thesis studied the form distribution of heavy metals in the sediment samples collected from Mochou Lake, Xuanwu Lake and Qinhuai River in Nanjing, analyzed the correlation between leaching contents of heavy metals and various forms and between content of organic matter and leachability of heavy metals and between organic matter and organic...
The leaching tests and the sequential extraction procedure of heavy metals in the stainless steel plant dusts were studied. The results show that the total Cr and Cr (VI) content in argon oxygen decarburization converter dust (AODD), and the concentrations of Cd and Zn in electric arc furnace dust (EAFD) exceed the national standards. Lead is the most extractable element by the sequential extraction...
The potential hazard of contamination directly depends on the presence and concentrations of mobile and biologically available element species. The mobility and availability of elements are known to depend on the chemical species of elements and the type of their bonding with the soil matrix. A three-step sequential extraction procedure (BCR-SEP) was used to determine the concentration of heavy metal...
The research reveals the relationship and enrichment of heavy metals in soil of sewage irrigation area in Guangdong province, southern China. Samples were collected from topsoil (0-10cm) and subsoil (30-40cm), and the total concentrations of heavy metals were extracted by HNO3-HF-HClO4. It is concluded that Cu, Zn, Cd, and Pb may be homologous or combined pollution, and Mn and Cr may be also homologous...
In this study, a novel ameliorant, calcined by a mixture of dry and semi-dry desulfurization residue and K-feldspar, was used to ameliorate acidic crimson soil which was widely distributed in South China. Application rates of the ameliorant were 0, 3.4, 6.8, 10.2 mg per hectare (ha) sweet corn fields, respectively. The planting test lasted a season. The height and perimeter of the sweet corn were...
The water system of Fen River in Shanxi province has upstream, midstream and downstream three sections, which are separately located in Jingyou, Jiexiu, Xiaodian, Hongtong, Linfen and Hejin, six sampling points are disposed there for the sake of collecting the samples of the filtered water and suspended matter, and measuring heavy metal contents. The measurement results show that heavy metal exist...
Heavy metal contamination of soil is of major concern from an ecological point of view. This study aims to characterize soil samples from different sites of two waste disposal grounds in Malaysia, to study heavy metal contamination in the landfill environment. The soil samples were obtained at different depths from 2m to 35m deep to find the possibility of heavy metal migration from the waste cell...
An exploratory study on sediment and soil contamination of heavy metals was carried out along Dalian coastal regions in Liaoning province, China. Estuarine intertidal sediment samples and their adjacent upland and paddy soil samples were analyzed by atomic absorption spectrophotometry for Zn, Cu, Pb and Cr. The contamination of the sediments and soils was assessed on the basis of enrichment factor...
Contents of heavy metals in six vegetable species and the corresponding rhizospheric soils around a lead-zinc mining and smelting plant in Nanjing, China were investigated to assess the possible risks of heavy metal posed to human health through food chain and to discuss the relationships of heavy metals contents in vegetables and the corresponding rhizospheric soils. Compared to national sanitation...
In this paper, a probe into the stabilization effects of ferrous sulfate (FeSO4) came from two aspects-stabilization efficiency and leachate content. Fe/As molar ratio, arsenic pollution intensity, soil pH, reacted time interval, competitive ions, such as sulfate(SO42-), phosphate(PO43-) and zinc ion(Zn2+), were studied in order to discuss their effects on the stabilization of arsenic. Results show...
In this work, the influence of tin on electrowinning of zinc from alkaline solution was observed. Tin changed the deposited zinc into compact form, made zinc hardly peel off from cathodes and should be separated from alkaline electrolyte before zinc electrowinning. Experiments for Sn removal from alkaline zinc solution by several chemical methods were tested. It was found that Sn can be cemented quantitatively...
The concentration of eighteen nutrients and heavy metals in E. crassipes collected from different sites in the North Zhejiang, China was concurrently studied. The concentration of the elements in whole plants was in the order of K (14896.92 μg g-1)>P (5775.78 μg g-1)>S (5596.38 μg g-1)>Ca (2368.92μg g-1)>Pb (2380.03 μg g-1)>Mn (852.90 μg g-1)>Fe (782.63 μg g-1) >Al (456.26 μg...
The study was aimed at investigating the local plants along two sides of Dagu River to achieve guidance on the harness, remediation or management of Dagu River. For this, the herbage plant species and their covering area, heavy metal contents in the plants, and the correlation analysis between metals in local plants and in nearby sediments were investigated. Results indicate that the dominant plants...
130 wet deposition events were observed at the summit of Mt. Tai (East China, 1534 a.s.l) in China during Jan. 2005 to Dec. 2008. Zn, Al, Mn, Fe, Pb, Cu, Ni, Cr, As, and Cd were determined by ICP-MS to evaluate the characteristics of heavy metals in wet deposition at Mt. Tai region. The concentrations of these metals are generally higher at Mt. Tai than the concentrations observed at other monitoring...
The water quality in rainfall, throughfall, stemflow and litterthrough in the Fraxinus mandshurica at Eastern Mountainous Region in Heilongjiang Province had been studied. The indicator included pH, Do, TURB, TDS, COND, ORP, K, Na, Ca, Mg, Cu, Zn, Mn and Fe. The results showed that the chemical properties of rainfall has been changed after it passing through forest canopy. The value of Do and ORP...
The coordination compound of L-hydroxyproline(Hyp)-Zn(II) was synthesized by L-Hyp and zinc sulfate as raw materials in water medium, and the coordination mechanism was studyed. IR spectra of L-Hyp-Zn(II) proved the coordination effect was produced between L-Hyp and Zn(II); 1H-NMR indicated that combination's position of L-Hyp is α-carboxyl and α-hydroxyl; Atomic Force Microscopy (AFM) observation...
A new type of inorganic polymer flocculant, polysilicate boron ferric and zinc sulfate (PSBFZ), was prepared through reaction of sodium silicate, ferric sulfate, zinc sulfate and sodium tetraborate. The Optimal synthesis process and material mixture ratio were determined by Orthogonal and single-factor experiments. Experimental results demonstrated that the optimal preparation conditions were as follows:...
Based on new portable instruments (mini-medium-volume sampler), intensive samplings on inhalable particulate matter (PM10) in Jiaozuo city have been conducted, the mass concentrations of PM10 was weighted, and the content of parts of heavy metals of PM10 was tested by ICP-MS in this paper. The relationship between the concentration of PM10 and the meteorological condition was discussed. The experiments...
Sludge can be used in agriculture as a fertilizer and soil conditioner. But heavy metals are one of the important factors affecting the sludge for agricultural purpose. In this study, the concentration of Zn, Cu, Pb, Cr, Mn and Ni in seven kinds of sludge from Guangzhou were analyzed and the chemical speciation of heavy metals in the five kinds of sludge were studied. The results showed that the concentration...
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